A straight conductor is placed in a uniform magnetic field.

PHYSICS · Multi-part · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A straight conductor is placed in a uniform magnetic field. (i) A

0.40\,\text{m}

long wire carries a current of

5.0\,\text{A}

and makes an angle of

60^{\circ}

with a

0.30\,\text{T}

magnetic field. Calculate the magnitude of the magnetic force on the wire. (ii) The current is then reduced by

40\%

and the wire is rotated so that it now makes an angle of

30^{\circ}

with the same field, while its length remains

0.40\,\text{m}

. Determine the new force.